What parts do you have for this 451? If you have to buy a crank you might as well go with more stroke same price. You will need another dist for a B engine. Intakes are not as plentiful as the Rb engine. Send the stealth heads to repeatable shop for some minor porting. If you rebuild your 440 with flat top pistons zero deck .039 head gaskets the right cam it should make for a nice pump gas driver. Same cost. I just pieced together a 511 RB shortblock Eagle crank, eagle rods, Icon pistons, main studs, line bore, .055 over, balancing and assembly $4600. That'll give you an idea of cost for just a short block without cam.
